Abstract
Our company is located at the central area of Fuji city, Shizuoka prefecture, and we have three mills around this area, Honsha mill Fuji, Honsha mill Suzukawa, and Honsha mill Yoshinaga. With a slogan “Respect Daishowa Earth Environment Charter”, which is our basic production policy, we are making effort in our daily production work to improve product quality, reduce production cost, maintain environment, and save energy, aiming at creation of a company culture to match with nature.
Recently, recycled pulp manufacturing plant was modified and expanded to produce more recycled fiber, and it increased steam demand for direct heating in the recycled pulp manufacturing plant to reduce recovery rate of the condensed water, and to increase the demineralized water supply.
This paper reports the results of installation of a plate type heat exchanger to improve lower generation efficiency and higher fuel consumption due to reduced heat recovery rate from the condensed water line as stated above. After taking these measures, temperature of the demineralized feed water has increased by using waste heat of the circulating cooling water of the turbine condenser, and the steam used in deaerator of the boiler feed water line is reduced. Also, the generation efficiency of the condensing turbine has improved and higher electric power generation and more fuel saving have been performed.
